dyscalculia
From Longman Dictionary of Contemporary Englishdyscalculiadys‧cal‧cu‧li‧a /ˌdɪskælkjəˈliːə/ noun [uncountable] a condition that makes it difficult for someone to recognize numbers correctly, so that they cannot do simple sums → dyslexia —dyscalculic adjective —dyscalculic noun [countable]